SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '353512f67a9e54275caa31b1fc38f89b4be2851382bca64097960a4363c47eba' 
  AND token = 'mjwHcKvA4G1O/69l3+y6YvSFWa1MtXjFrcQVhDWlCDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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