SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0df410db3db811164670261a2d7ecfd453622a9f5bf4ce8f8a2d469fe51e6dee' 
  AND token = 'VsnKHDuRCuYDMpzj+rDuTusLJGvNJpCV/RZ8YEr3tLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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