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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '081b209fa9b4b03994538109aa9a83bb1c6d749d0c007e3d78958191ccfe4d8c' 
  AND token = 'uuZJbqKjTke0/Mqw2HRGcP9w9KmrhsNomNug0iFAjDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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