SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf5040e167fb1ce8b857789081b7f34a9bd2a9c7d279c9f6d6737b562152724e' 
  AND token = 'Ec+YW18JuR/e7DNixXJvgBgqL8HwmXGsKORAdCOWGF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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