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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '753c76562abc7dd367696a8158f30045759fea6f0e5a651ec30eddfcbb9991f9' 
  AND token = 'tGdTfBkIsXEhLSl4l6uFZC9Ydnd251CY8qz+wuZpDtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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