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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fcf7a3bc0f8329ceba8d7df9d5e862b412a9c7b58f1acd292fb9ede2944d136' 
  AND token = '83+9EoO7kvQt1iVLHGmRiA/4Eq6LToinVjowk6oAotg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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