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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1af2060331bc23272d8220a28a0d9bb842c474be095f0648b8b66f958cd5b9b5' 
  AND token = '/ohQd/0OlzyoabSZZi5mpFZX5fA/K32mMVICqWMmO1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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