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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4ac23711dc1a879c3cbac7a4dfbcb14c54ee9403967d2ab4b72d3be699eee47' 
  AND token = '59NItovTgSaxl3W2zgCk1fqHB+uOGJ+uheDFrsQoWSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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