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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '712d98337917115266fe7ced489626a2330e7bb92d2defc43b33909bf3c46644' 
  AND token = '0vrtLJ9o4svS9k9Z67COlRZfbrPq3jQLBOlD6RtwDq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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