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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39fb3f52416d2510bd35aa6e65a10637eb538009f4f231ce62ca8d14a420ed9d' 
  AND token = 'takFjVbOLiHCn8IvLfa1NNXuqk/Wx/lakxpWfpBZ1L8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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