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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47b3d29656ea12fa6232232fd617581992e046e700a882af4e1d8b96f807eea7' 
  AND token = 'vTe/5oAk6VouxBGi+4qxlbqAhb80oHkH0PQarkL6SzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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