SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89e0a267398e102c99f59f11c0880b13deccb35b2684349e14c4a63bc4b4a8d8' 
  AND token = '7cfUv+hrqKsFjBGXSDB+AaWG/1Phgba5z5dFzsYGfTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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