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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe6e123f6055144fed27843cb6d8c96cbfed8a18c2f0958a34a4374c0ab1e83b' 
  AND token = '23Ik7Mo4kr37D0V0ErGA6hk3zIXSWg7c4K8E7iQES/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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