query optimization delete nested query Can the following query be optimized ?

DELETE FROM COLOR_TAGS 
WHERE COLOR_PROJECTID = $id 
AND NoteID IN(
SELECT ID FROM note_note 
WHERE BibID=$bid AND isdel=0);
Add composite indexes to your tables:

On COLOR_TAGS, index (COLOR_PROJECTID, NoteID)

On note_note, index (isdel, BibID, ID).