Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c28ef41d24f6841427eafc3f7102dce87eb4b33e12c1b800c08b516fc80d194' 
  AND token = 'zOSdNfaRpp3lFc0MrsuMZm8v4MSRJCGPi+sQAOrUsFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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