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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69c9cb48f3ad0733796da7de7212f9bd51b255cfe252cff1b823fe0ed6072819' 
  AND token = '/mxf2KgrjNKzWdryPhrJpfP/qkeCU49Pi3VcE4+Fd3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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