address the comment

planner/core/find_best_task.go

@@ -914,7 +914,7 @@ func (ds *DataSource) findBestTask(prop *property.PhysicalProperty, planCounter
 		}
 
 		// if the path is the point get range path with for update lock, we should forbid tiflash as it's store path.
-		if path.StoreType == kv.TiFlash && ds.isForUpdateRead {
+		if path.StoreType == kv.TiFlash && ds.isForUpdateRead && ds.ctx.GetSessionVars().InTxn() {
 			if ds.isPointGetConditions() {
 				continue
 			}

planner/core/integration_test.go

@@ -7572,6 +7572,7 @@ func TestPointGetWithSelectLock(t *testing.T) {
 	tk.MustExec("set @@tidb_enable_tiflash_read_for_write_stmt = on;")
 	tk.MustExec("set @@tidb_isolation_read_engines='tidb,tiflash';")
 	tk.MustExec("begin;")
+	// assert point get condition with txn commit and tiflash store
 	tk.MustGetErrMsg("explain select a, b from t where a = 1 and b = 2 for update;", "[planner:1815]Internal : Can't find a proper physical plan for this query")
 	tk.MustGetErrMsg("explain select c, d from t1 where c = 1 for update;", "[planner:1815]Internal : Can't find a proper physical plan for this query")
 	tk.MustGetErrMsg("explain select c, d from t1 where c = 1 and d = 1 for update;", "[planner:1815]Internal : Can't find a proper physical plan for this query")
@@ -7581,6 +7582,10 @@ func TestPointGetWithSelectLock(t *testing.T) {
 	tk.MustQuery("explain select a, b from t where a = 1 and b = 2 for update;")
 	tk.MustQuery("explain select c, d from t1 where c = 1 for update;")
 	tk.MustExec("commit")
+	tk.MustExec("set tidb_isolation_read_engines='tidb,tiflash';")
+	// assert point get condition with auto commit and tiflash store
+	tk.MustQuery("explain select a, b from t where  a = 1 and b = 2 for update;")
+	tk.MustQuery("explain select c, d from t1 where c = 1 for update;")
 }
 
 func TestTableRangeFallback(t *testing.T) {