SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0113312e5ca3eb90d117526767f450008b0deaff99da143320e75a79e1fa8a42' 
  AND token = '2/pjEl1+YsV1OttzAJiCf/HwBiLc6qVKfn5w+a3FUsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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