SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6535dc3a1ca237c39b974871d37f55bb4041472b17af17a10257fd8f67c1ebe' 
  AND token = 'IuC+aHwq4c3V7zKwL8K+o/yl5HVDSlFDSJQpHg2BllE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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