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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50913f4e2ba5d07e7741d82f320480fc32d02377051ed00c17a36554349df584' 
  AND token = 'DHy86OkJlEkO0qHsZ5M43GEEvzK9qm/RoqNbKK8Yows=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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