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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd24cdd2917c69af470eb0927455c67af50343a8679efcbbd6739fbebc942cc1f' 
  AND token = 'gG6XSsDR8DiTdPX0P9wW1RrUwsda3JxM5xxMIyQQKfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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