SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb23b6d486b240cf3ed3ea5d4597db0555287e0ae2afdf51f3ec4b6e02473f08' 
  AND token = '+gT19X+xP8yqGpi6JQHdLRYZyQb47W6Byu90Qv/93vU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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