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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1116f5dc5a5ee781f0c300163cdc5bd48b30bda70d499cb5722c454948d66b3' 
  AND token = 'Rk147L4RdIgqZt79a9DjXG3xnupSNMUWNVLR3zaGoyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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