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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a788f49ca4b56733b2379199c623eaaa648e82e78470a9a626b144c636e6ece' 
  AND token = 'xU6pQkfFNB0CP17MlHlFREH0gMVq8CB8alztBCQZ8eA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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