SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13e8c6abbbf067133c7f32104c7d277d7a7c354568e21862fd43e1e6cca72fdb' 
  AND token = 'FnNWJuT0SdvCqNq+zF+wKMyXkZlY8i1ILKTMppA//Ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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