Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '391e75c639a6c48d0b0a407cbe2b6cf604dd1e722ea567ed003080d32ad477a1' 
  AND token = 'UMLScajeWGx/YYOcbHWvIppsbE693yRmX+uc1qwB7Ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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