SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79856cef06e614bca31d560a5dd13854b6df72bb0c333a5035da5affd34d5870' 
  AND token = 'CcGQ0Y7/7688f+lWXYzKxbDfCPjJ2MmSXLdIwqv4PYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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