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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7189dfb873411467f6fe9859da6e3fd6c3f93c5ee328201d5011605fd73f33f7' 
  AND token = 'lDWYuT7ENJNzv3H5vSVbUgHFc8EdCg6uCaTfFC1aUrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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