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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7939b722d14612b7bd6cddbb00a06e30bc80ba83c939bf87b91ef9b3914b944a' 
  AND token = '7jtAXxhL/P/EpOcKY8lpC36GE7YzZJeesmfrDNz9h6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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