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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c38a3948faed643a7df47323b1b50f531500222d820e7c4ee27cd8929815bda' 
  AND token = 'LHlp6rHU2DhJNbMbl0l4tbkXYpOgqkG7ZQ3u+pCSIOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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