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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d3f1c5e655344e835deee4f52f14e8f692a275544f42e7e99a34f647669212f' 
  AND token = 'NIwmPIjfdqsUh2scm1cZRbYoB7IE5/JYRCoztPNUeUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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