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SELECT 
  * 
FROM 
  cscart_product_options_exceptions 
WHERE 
  product_id = 8864 
ORDER BY 
  exception_id

Query time 0.00028

Explain
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	cscart_product_options_exceptions	ref	product	product	3	const	8	Using where; Using filesort

Result

exception_id	product_id	combination
3097	8864	a:2:{i:1101;s:5:"20789";i:762;s:5:"16362";}
3098	8864	a:2:{i:1101;s:5:"20789";i:762;s:5:"16365";}
3099	8864	a:2:{i:1101;s:5:"20789";i:762;s:5:"16366";}
3100	8864	a:2:{i:1101;s:5:"20789";i:762;s:5:"16464";}
3101	8864	a:2:{i:1101;s:5:"20800";i:762;s:5:"16366";}
3102	8864	a:2:{i:1101;s:5:"20801";i:762;s:5:"16365";}
3103	8864	a:2:{i:1101;s:5:"20801";i:762;s:5:"16366";}
3104	8864	a:2:{i:1101;s:5:"20801";i:762;s:5:"16464";}