id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	match_yellow_card	index_merge	idx-match_yellow_card-match_id,idx-match_yellow_card-player_id	idx-match_yellow_card-match_id,idx-match_yellow_card-player_id	4,4	NULL	1	Using intersect(idx-match_yellow_card-match_id,idx-match_yellow_card-player_id); Using where; Using index