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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84da2af265f45789c2764aeaae78f9868b7d645ed3e1109a4eb7b1328372dd13' 
  AND token = 'wI73n0K7N2zOoDUJ0XqKTh7ehwHYaXWNy5XfuL/mync=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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