SELECT 
  * 
FROM 
  cscart_product_options_inventory 
WHERE 
  product_id = 9845 
  AND combination_hash = '2193058762'

Query time 0.00027

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
9845 ODV-DSL-C01-0705K 2193058762 955_18542_1154_21870_1155_21886 0.00 N 96 704.07 3.00 0 0 0 0 15