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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f69d8b02f11fe12b7eefb5706594bc406ff63d803497966a329b145adefa796' 
  AND token = 'O2kDoJ83+IWrJlVr5m0IsVx6fQZk2Bk/IePG0ux+b0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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