Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a866a366aa1a9d123e18d8220665239784643292666a1e923e120b68fe87ba7' 
  AND token = 'qXJFmSGe4NfCqDE+/8kVgNnjoodOxa1aeTTbNdEIQwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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