SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d7e3757e99c7fdeeb10b55ae75f4583cb5fc21818be05b2208d07a16d9b025b' 
  AND token = 'QWG3V8z/TT8xpHlOJh9cCplKtN22IssCRjVHM+6+6vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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