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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c318946ff9e5f987ded72fb43e35aba80e7c314d2731fccff5caf1774f6c9e68' 
  AND token = '+gcZYoK4BseLDlZeWpf14HK0W4UQn8VaYgGYB+RWHKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00112

JSON explain

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