SELECT 
  * 
FROM 
  cscart_product_options_inventory 
WHERE 
  product_id = 10707 
  AND combination_hash = '2203806684'

Query time 0.00024

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE cscart_product_options_inventory const PRIMARY,pc PRIMARY 4 const 1

Result

product_id product_code combination_hash combination amount temp position price weight min_qty max_qty qty_step list_qty_count aval_status
10707 SKY-ROP-0507-MGR-SXL-051 2203806684 485_12642_614_15104_484_15431 0.00 N 0 192.00 2.00 0 0 0 0 0