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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47c5acab918b666578fb7b922a144bf229233fc0094e6fae3f841a9226618df0' 
  AND token = '5jbXnJTrL02De9dkS8EcSu+TdC0fVrM0TK8UfVhkngg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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