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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de75ce3da31acc11e8f45e27e3266fd5f2e149857ae3702fec8adb03f5b9cec6' 
  AND token = 'nhyWIplDeYA7N6KIf1nuOlursueQfMvA3vE9nSwvdDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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