SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c7779a03faf7f400c1f1b417cd504dc5595eb7bf3b49b16c4211303934e5456' 
  AND token = 'vMUc70e5owDJ8cpzL14fzgmvO3+DhCoJ/xzrYj7SLfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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