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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29553d03763574a8e0f947673b616ab37702da647262df06a755485a37f04fda' 
  AND token = '3bgRpnazsix7OM8spgbWW/lamYnEyFWPa23JB0WvH3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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