SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a7f91b57297640ff40eed067b561fd81cd8e359d09ff13a69aa1f46d2eb0f64' 
  AND token = 'G+lRgv3GWVE4lyv4W7Bmccj3BAPqPh28p4oq+kb5sJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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