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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8595d12c8f4cc8f0791a7afc2461deeed3517e4fc03a296a5e9da48411a35afa' 
  AND token = 'KRb5WdliA5ucT3sKVOsgdoKosx53jp/gOHmkbB2EwXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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