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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3c3a0158ec4a43f5b78ea6b8cde13b5ef2314425e3ca81571f8723394400bee' 
  AND token = 'vwPYUKjIHiSdHng5mm49Z+UJ3QQz4ZSwzOwa27NXJsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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