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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08b6fe5322866b3d196c776830379b994103221a389fcee8d56ff011d96cc8b1' 
  AND token = '0YXa4S8QTKJasdHu3lt1s33WyxTvEGDP6hRYhAi0ZJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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