SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fab5bbbfb55fa5be94ee8dc0344f70fc83ad3f09633a9db6dbc02b8e001ccb5' 
  AND token = 'bfqO+KuH9vGmHj2oZ9zL+DsSstxwoBfmCiRvrhpUg/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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