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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c33cfc71b3952dce5067dbc681042b6eab9012b8d05a873ffc9ecc0e8440d55' 
  AND token = '4BhRf/tDHrL7qy26WdREsrZJgPc9wq02Z7nS/3EKlLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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