SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9727c5bc8ad5df46d69e380c0042a76575954bea302462c577fc81ba6d58b801' 
  AND token = 'VFIXOS2Y8GgHnGl8B2DwfGoFwmcLoZAvB1TE10WQVRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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