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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc6c731bae45c70522b826e8c185c26d7e5f11445b06a9c861cf3e2b2f29515c' 
  AND token = '5rGWcMyRSRDBwhi146spL29uuYuq6/cBzJP7x7t/duU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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