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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a1daab503a4505d31318fbe72615aeaf17489716a99cbf26ab97d539ab9b8cb' 
  AND token = '9o3HJE5YRp4Ld6RvW2dt6VikmZKxPtbKXAwxdyyhsx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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