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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbe0dc549ffc6a92bc1b91cd1b90787a64e66d9f093d90d6a179736f6d4eb551' 
  AND token = 'VczS4Md+/d+y/XKTdjrram/ItxyF4Vo/mPRxDx3aNGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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