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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef8baa72e62428d6aa06cd60c3c09e30455de05372fe5dcc90aa273da5acbda0' 
  AND token = '8YAf1pMMhZBYLW16l8WB14RMIyu0Uni9Mkk7UzTR+7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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