SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1463fdc1ec5c1719639c7d227849dac61256f40805227a94c27f8ae23441010' 
  AND token = 'YeH0+8z/CtZ7CZoOvh2mGhMYfoyqpLrQuOmlT748wPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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