SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cce4be83cc0b0331050862a0cb99398085b98f9dfaef7ecf194f8465ecd8ae47' 
  AND token = 'nCZMu+iiHd27VJG3gYHjxeINozMtUpB0/lXkPrx/XQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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