SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62e13d528a43975d379d3e6d3baf423bd53357b27dcd42e5502882ce0b5a759d' 
  AND token = '+Y1Kz5sT86h4Hgw5VpZG0OMWRJSaa96GpVWQdtfqUJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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