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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4823b33c17f879e73840b86939280e77074508aee18f4b4cafe44468cd3335a9' 
  AND token = 'lcBf3fmemz+g7oF3zO4ED56CHJSnnJBHceeQ+w7tOys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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