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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cdacf2636b8cd1626bd9ef48d73d629a1c9d7ec8718ce3ac33e4c27ea9ecb2e' 
  AND token = 'vtQxqxc/K1+Y2MP6RSAlpAzI9RzTVfQSB7Wl1io/DSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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