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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71fa715ded993c6164bbaa776aeaea0b7a7e39d8ed55a496b5789fba8ce1b8ea' 
  AND token = 'V4+I/ymR49hwWelGVjkCsbQrRAkUQz7CcYcEIbsjOow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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