SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1148fca59effc592ab2285cd016bb04385fb074abd5a53aa41f29704624b3ba' 
  AND token = 'Rv9OVHUYvnXKv39K3mjkOU2UzO8lMBd2vo0HJ9gLCj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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