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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '058ee3cb972ce84bad9d26639fd041387bedde7ad7ac809458f316b8a31f2078' 
  AND token = 'BA2mt2+vriF1V9IsLMDMMc2HBKxcJkj2iu+SLOTxRMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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