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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bcfc8b805f21e10c6e526e629edb725e9224a3c25401e4d771fc5d5116af86c' 
  AND token = 'mipyNidOGzwFb5yteRHwX5LGRj0f1zOeUZjvptJYh7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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