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SELECT 
  * 
FROM 
  cscart_product_options_exceptions 
WHERE 
  product_id = 10212 
ORDER BY 
  exception_id

Query time 0.00030

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
3128	10212	a:2:{i:1104;s:5:"20855";i:762;s:5:"16362";}
3129	10212	a:2:{i:1104;s:5:"20855";i:762;s:5:"16365";}
3130	10212	a:2:{i:1104;s:5:"20855";i:762;s:5:"16464";}
3131	10212	a:2:{i:1104;s:5:"20855";i:762;s:5:"16366";}
3132	10212	a:2:{i:1104;s:5:"20866";i:762;s:5:"16366";}
3133	10212	a:2:{i:1104;s:5:"20867";i:762;s:5:"16366";}
3134	10212	a:2:{i:1104;s:5:"20867";i:762;s:5:"16464";}
3135	10212	a:2:{i:1104;s:5:"20867";i:762;s:5:"16365";}