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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '052321f149ec1f5eea502010835eff816b213beefe65152b40803dbc4240f8b8' 
  AND token = 'r0wU0xgjaE6VINtn9S5jOFFVxWSEQIm7uinmtPcU+j8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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