SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07e688d349057bd2398dbc91e476561372d071e4437892222cf433d4f5999de0' 
  AND token = 'uaVy+RS7Yf/0w3CtauuzdEOVAJvUprYK06VchgBIEF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}