SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efd33b8784a5b468bd36a996b7cdf3b522275da07d30e4bda9ac162deef60b38' 
  AND token = 'KiaFvLGHv2QgGP+M477F6K5UjvjpZliX18L/dplb1UU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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